1/* Utilities to execute a program in a subprocess (possibly linked by pipes
2   with other subprocesses), and wait for it.  DJGPP specialization.
3   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005
4   Free Software Foundation, Inc.
5
6This file is part of the libiberty library.
7Libiberty is free software; you can redistribute it and/or
8modify it under the terms of the GNU Library General Public
9License as published by the Free Software Foundation; either
10version 2 of the License, or (at your option) any later version.
11
12Libiberty is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15Library General Public License for more details.
16
17You should have received a copy of the GNU Library General Public
18License along with libiberty; see the file COPYING.LIB.  If not,
19write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22#include "pex-common.h"
23
24#include <stdio.h>
25#include <errno.h>
26#ifdef NEED_DECLARATION_ERRNO
27extern int errno;
28#endif
29#ifdef HAVE_STDLIB_H
30#include <stdlib.h>
31#endif
32#include <string.h>
33#include <fcntl.h>
34#include <unistd.h>
35#include <sys/stat.h>
36#include <process.h>
37
38/* Use ECHILD if available, otherwise use EINVAL.  */
39#ifdef ECHILD
40#define PWAIT_ERROR ECHILD
41#else
42#define PWAIT_ERROR EINVAL
43#endif
44
45static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
46static int pex_djgpp_open_write (struct pex_obj *, const char *, int);
47static long pex_djgpp_exec_child (struct pex_obj *, int, const char *,
48				  char * const *, char * const *,
49				  int, int, int, int,
50				  const char **, int *);
51static int pex_djgpp_close (struct pex_obj *, int);
52static int pex_djgpp_wait (struct pex_obj *, long, int *, struct pex_time *,
53			   int, const char **, int *);
54
55/* The list of functions we pass to the common routines.  */
56
57const struct pex_funcs funcs =
58{
59  pex_djgpp_open_read,
60  pex_djgpp_open_write,
61  pex_djgpp_exec_child,
62  pex_djgpp_close,
63  pex_djgpp_wait,
64  NULL, /* pipe */
65  NULL, /* fdopenr */
66  NULL, /* fdopenw */
67  NULL  /* cleanup */
68};
69
70/* Return a newly initialized pex_obj structure.  */
71
72struct pex_obj *
73pex_init (int flags, const char *pname, const char *tempbase)
74{
75  /* DJGPP does not support pipes.  */
76  flags &= ~ PEX_USE_PIPES;
77  return pex_init_common (flags, pname, tempbase, &funcs);
78}
79
80/* Open a file for reading.  */
81
82static int
83pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
84		     const char *name, int binary)
85{
86  return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
87}
88
89/* Open a file for writing.  */
90
91static int
92pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
93		      const char *name, int binary)
94{
95  /* Note that we can't use O_EXCL here because gcc may have already
96     created the temporary file via make_temp_file.  */
97  return open (name,
98	       (O_WRONLY | O_CREAT | O_TRUNC
99		| (binary ? O_BINARY : O_TEXT)),
100	       S_IRUSR | S_IWUSR);
101}
102
103/* Close a file.  */
104
105static int
106pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
107{
108  return close (fd);
109}
110
111/* Execute a child.  */
112
113static long
114pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
115		      char * const * argv, char * const * env,
116                      int in, int out, int errdes,
117		      int toclose ATTRIBUTE_UNUSED, const char **errmsg,
118		      int *err)
119{
120  int org_in, org_out, org_errdes;
121  int status;
122  int *statuses;
123
124  org_in = -1;
125  org_out = -1;
126  org_errdes = -1;
127
128  if (in != STDIN_FILE_NO)
129    {
130      org_in = dup (STDIN_FILE_NO);
131      if (org_in < 0)
132	{
133	  *err = errno;
134	  *errmsg = "dup";
135	  return -1;
136	}
137      if (dup2 (in, STDIN_FILE_NO) < 0)
138	{
139	  *err = errno;
140	  *errmsg = "dup2";
141	  return -1;
142	}
143      if (close (in) < 0)
144	{
145	  *err = errno;
146	  *errmsg = "close";
147	  return -1;
148	}
149    }
150
151  if (out != STDOUT_FILE_NO)
152    {
153      org_out = dup (STDOUT_FILE_NO);
154      if (org_out < 0)
155	{
156	  *err = errno;
157	  *errmsg = "dup";
158	  return -1;
159	}
160      if (dup2 (out, STDOUT_FILE_NO) < 0)
161	{
162	  *err = errno;
163	  *errmsg = "dup2";
164	  return -1;
165	}
166      if (close (out) < 0)
167	{
168	  *err = errno;
169	  *errmsg = "close";
170	  return -1;
171	}
172    }
173
174  if (errdes != STDERR_FILE_NO
175      || (flags & PEX_STDERR_TO_STDOUT) != 0)
176    {
177      org_errdes = dup (STDERR_FILE_NO);
178      if (org_errdes < 0)
179	{
180	  *err = errno;
181	  *errmsg = "dup";
182	  return -1;
183	}
184      if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
185		 STDERR_FILE_NO) < 0)
186	{
187	  *err = errno;
188	  *errmsg = "dup2";
189	  return -1;
190	}
191      if (errdes != STDERR_FILE_NO)
192	{
193	  if (close (errdes) < 0)
194	    {
195	      *err = errno;
196	      *errmsg = "close";
197	      return -1;
198	    }
199	}
200    }
201
202  if (env)
203    status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
204	      (P_WAIT, executable, argv, env));
205  else
206    status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
207  	      (P_WAIT, executable, argv));
208
209  if (status == -1)
210    {
211      *err = errno;
212      *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
213    }
214
215  if (in != STDIN_FILE_NO)
216    {
217      if (dup2 (org_in, STDIN_FILE_NO) < 0)
218	{
219	  *err = errno;
220	  *errmsg = "dup2";
221	  return -1;
222	}
223      if (close (org_in) < 0)
224	{
225	  *err = errno;
226	  *errmsg = "close";
227	  return -1;
228	}
229    }
230
231  if (out != STDOUT_FILE_NO)
232    {
233      if (dup2 (org_out, STDOUT_FILE_NO) < 0)
234	{
235	  *err = errno;
236	  *errmsg = "dup2";
237	  return -1;
238	}
239      if (close (org_out) < 0)
240	{
241	  *err = errno;
242	  *errmsg = "close";
243	  return -1;
244	}
245    }
246
247  if (errdes != STDERR_FILE_NO
248      || (flags & PEX_STDERR_TO_STDOUT) != 0)
249    {
250      if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
251	{
252	  *err = errno;
253	  *errmsg = "dup2";
254	  return -1;
255	}
256      if (close (org_errdes) < 0)
257	{
258	  *err = errno;
259	  *errmsg = "close";
260	  return -1;
261	}
262    }
263
264  /* Save the exit status for later.  When we are called, obj->count
265     is the number of children which have executed before this
266     one.  */
267  statuses = (int *) obj->sysdep;
268  statuses = XRESIZEVEC (int, statuses, obj->count + 1);
269  statuses[obj->count] = status;
270  obj->sysdep = (void *) statuses;
271
272  return obj->count;
273}
274
275/* Wait for a child process to complete.  Actually the child process
276   has already completed, and we just need to return the exit
277   status.  */
278
279static int
280pex_djgpp_wait (struct pex_obj *obj, long pid, int *status,
281		struct pex_time *time, int done ATTRIBUTE_UNUSED,
282		const char **errmsg ATTRIBUTE_UNUSED,
283		int *err ATTRIBUTE_UNUSED)
284{
285  int *statuses;
286
287  if (time != NULL)
288    memset (time, 0, sizeof *time);
289
290  statuses = (int *) obj->sysdep;
291  *status = statuses[pid];
292
293  return 0;
294}
295